Guide means for two for one twisting device

ABSTRACT

An improved two for one yarn twisting machine having a guide means rotatably mounted between the yarn package and the take-up means. The guide means has a pin or pins and a roller or rollers around which the yarn is looped and is rotated in the same direction and at the same speed as the twister balloon to control friction in the yarn linear movement, consequently decreasing yarn tension and enabling the use of higher linear speeds.

Brockel 57/5859 United States Patent 1 1 1 3,811,259 Petersen 1 May 21,1974 GUIDE MEANS FOR TWO FOR ONE 3.330.104 7/1967 Dunwoody. Jr .1 57/773x TWISTING DEVICE 3,475,895 11/1969 Raschle 57/77.3 3,574,273 4/1971Hilbert 57/773 [76] Inventor: Philip R. Petersen, 1427 Hartford FOREGNPATENTS OR APPLICATI NS Ave., Charlotte, NC. 28029 Q 1,045,746 10/1966Great Britain ..'-57/58.59 1 Flledr J 1971 1.440.294 4/1966 France...57/5859 21 A 1. N 154,978 1 pp 0 Primary Examiner-John Petrakes [52]1.1.8. C1. 57/58-83, 57/5859 57 ABSTRACT [51] Int. Cl. D0lh 1/10 An imroved two for one y twisting machine [58] Field of Search 57/5849,58.59, 58.57, p l d b h 57/5883 5886 5852 77.3 7737 mg a guide meansrotatab y mounte etween e yarn package and the take-up means. The guidemeans has a pin or pins and a roller or rollers around [56] Referencescued which the yarnis looped and is rotated in the same di- UMTED STATESPATENTS rection and at the same speed as the twister balloon to2,143,203 1/1939 Maxham.... 57/5859 onn-o] friction in the yarn linearmovement c nsegegg gg 132% 3 3 5 quently decreasing yarn tension andenabling the use ac 1e.... I 3.106.816 10/1963 Mackie 57/5852 of hlghe'lmear r 3.377.790 4/1968 6 Claims, 4 Drawing Figures PATENIED m 2 1 19143311.259 sum 1 or 3 Fla. 1

INVENTOR PHILIP R. PETERSEN PATENTEDIAYZI'IQH sum 2 OF 3 I. I i a Jiuvsurok PHILIP R. PETERSEN r ATTORNEYS W JM /M PATENTEDIAYZI m43.811.259

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INVENTOR PHILIP R. PETERSEN ZJQQQQWMWM ATTORNEYS .1 GUIDE MEANS FOR TWOFOR ONE TWISTING DEVICE This invention relates to a yarn twistingmachine and more particularly to a two for one twister capable of highspeed operation consistent with yarn of high quality and free ofbreakage. It includes an improvement in the guide means positionedbetween the twisting device and a take-up reel in such a machine. In atwo for one twisting machine, two turns or twists are imparted to theyarn for each revolution. To control the yarn balloon and twisting, theyarn is usually passed through a fixed eyelet or over a fixed pin orroller which is positioned between the twister and the take-up means.This leads to tension in the yarn since the eyelet, roller or pincreates friction opposing the yarn travel. The minimization of suchfriction is highly desirable along with the minimization of tensionwhich can lead to breaking of the yarn, especially delicate yarns.

It is therefore an object of this invention to provide an improvement ina two for one twisting machine whereby yarn tention can be greatlydecreased so as to minimize the amount of yarn breakage, particularly ofdelicate yarns when operating at high speed.

It is further object of this invention to minimize friction along thelinear travel of the yarn so as to facilitate maximum yarn linear speedof movement.

Further objects and advantages will become apparent from the followingspecification taken in connection with the drawings which form a part ofthis application and which are given for. purposes of illustration onlyand not of limitation, in which:

FIG. 1 is a side view ofa twisting machine employing the improvement ofthis invention;

FIG. 2 is a sectional view taken along line 22 of FIG. 1;

FIG. 3 is a sectional view similar to FIG. 2 but utilizing pins insteadof a roller; and

FIG. 4 is a top view of the guide of FIG. 3.

Turning now to the drawings in greater detail, the twisting device has ayarn package 12 in a stationary position within a container 14.Co-axially located within the container is a twister tube located belowits extension 16 which is rotatably mounted to be driven by a belt 19through a pulley 20. The pulley is preferably grooved and the belt hascomplementary cogs so that a fixed speed can be maintained without anyslip or drift in relation to the driving motor. The belt istrainedaround pulleys 22 and 24 and is driven by a motor. The return runof the belt is on the opposite side of the machine (not shown) andfollows a path similar to that shown.

The yarn 28 is brought up from the package 12, through an optional flyer30 and is then threaded through the center of the twister tube 16extension and out through a radial opening in disc 32 where it isbrought up inside a balloon control shield 34. A loop or ballon isformed in the yarn by the centrifugal force of the twister as the yarnmoves off the package and upwardly. At 36 is a conventional take-upmeans such as reel with a traversing device for laying up smooth layerson that reel.

The preceding two paragraphs describe a device which is well known inthe prior art and is described here only for purposes of completeillustration. The improvement of this invention will now be discussed indetail.

Located between the take-up means 36 and the package 12 is the guideassembly 38 of this invention. This guide, of suitably hard material inorder to resist wear by the rapidly travelling yam 28 moving lengthwisethrough it, is mounted for free rotation in support 46 by means of lowfriction bearings 44 which may be ball, needle, or roller or othersuitable types (see FIG. 2). The guide is driven by belt 18 through apulley which preferably has grooves which mate with cogs on the belt soas to provide a positive, non-slip, non-drift drive. The belt is trainedaround pulleys 48 and 50 and is driven by any suitable means so thatexact control of the speed of both the tube 16 and the guide 42 can beassured. Thus, pulleys 40 and 20 and their drive means would be suchthat the guide 42 would turn at the same speed as the twister. They, ofcourse, turn in the same direction. Belts l8 and 19 could be driven froma common motor having a vertically extending shaft parallel to pulleys20 and 40.

As the yarn moves lengthwise along its path of travel between thepackage 12 and the take-up means 36, the yarn itself is also moving ina'wide sweeping loop or ballonwhich will tend to frictionally engage anysurface with which it comes in contact. Through rotation of the guide 42and its flared end 43 in the same direction as the twister tube 16, anywiping action of the yarn against the interior of the flared end 43 isvirtually eliminated. .To facilitate high speed yarn movement, all edgesof the guide 42 and flared end 43 are smoothly rounded in order toeliminate any sharp bends.

The amount of flare or funnel shape'in the end 43 is, of course,dictated by the spacing between the guide and the package below. At theupper outlet rounding of edge 56 is dictated by the spacing between theguide and the take-up mechanism above. The important point is that theguide is rotating in a direction and speed which corresponds to therotational direction of v the balloon as it travels around the packageafter having been twisted. The speed of rotation of the guide should bethe same speed as that of the twister.

In the prior art various forms of fixed eyelets, pins, or idler rollerswere positioned betweenthe take-up and the package to control theballoon or to provide an upper fixed point, below which the twistingwould take place. These types of guides acted as friction points andcreated unnecessary tension, thus limiting the linear yarn speed to arate which would not be damaging to the yarn. In the present apparatusnot only is roller 58 freely rotatable about axis 60 but axis 60 is alsorotated in its own plane, that is rotated with the guide. Thiseliminates unnecessary tension in the balloon thus enabling very highspeeds to be reached as the yarn moves through.

In the present invention, smoothly curved idler means are carried by therotate with the guide 42. This idler means can be a single roller asdepicted in FIG. 2 or a plurality of rollers. It can also be one or morepins 62 and 64 positioned in the guide as shown in FIGS. 3 and 4. Theidler means can be located in the lower part of the guide as shown inFIG. 2 or farther up in the tube as in pin 62. The important point isthat the idler means furnishes a smoothly curved surface over which theyarn passes and that surface is rotating at the same speed and in thesame direction as the yarn balloon- Thus the idler means and the guidedo not resist the linear yarn travel but move in syncronism with it andkeep a proper balloon.

.and to the left of an upper pin 62. These pins are offset in oppositedirections from the central axis of the guide, pin 62 being to the leftand pin 64 to the right center. The guide has a smoothly rounded inletand outlet 56 to insure free yarn travel. The pulley 40 is the same asthat shown in FIG. 2 and it is to be understood that the guide in FIG. 3is mounted in suitable bearings and holders such as depicted in FIG. 2.and would be mounted and driven in the same manner as shown in FIGS. 1and 2. Since the yarn is confined to a particular portion of the guideinterior by each of the pins, it will be rotated along with the guideand, as previously discussed, that rotation is at the same speed anddirection as the yarn balloon. A single pin or a group of pins could, ofcourse, be used as well as the pair of pins illustrated. The pin or pinscould be located anywhere in of the balloon and hence reducing twistingtension. The

size of the balloon is in direct relationship to these tensions. If theballoon is positively driven ,at the same speed as'the twister, thesetensions will be eliminated. Thus, the method of the present inventioninvolves reducing the twisting tension of a yarn in'a two for onetwister by eliminating tension between the yarn package and the take-upmeans. By positively driving the guide in the same direction and at thesame speed as the two for one twister, the yarn tension within. theballoon is substantially reduced, principally because both ends of theballon are being driven at constant and controlled speeds thus resultingin absorbing or transferring yarn balloon inertia from the balloon intothe driven guide. It is thus important that the twister and the guide bedriven at the same speed, allowingno lack of control which could causedrift or slippage which would result ina corresponding increaseintension in the balloon; i Y

What is claimed is:

1. In a two for one strand twisting machine having a stationary yarnpackage,ta single rotatable twister tube located co-axially'within saidpackage, a rotatable disc below said package andtake-up means above saidpackage for drawing yarn therefrom and forming a free balloon in theyarn between the disc and the take-up means, the improvement comprisingmeans between the balloon and take-up means to reduce friction on theyarn having:

a. a rotatable guide means for the yarn to pass through positionedbetween the free balloon and the take-up means, the guide havingsmoothly curved idler means to contact and rotate the yarn;

b. means to drive the twister tube and the guide means in the samedirection and at the same speed.

2. The device of claim 1 in which the idler means is a roller mountedfor free rotation on an axis substantially perpendicular to the axis ofsaid guide means.

3. The device of claim 1 in which the idler means is at least one pinwith its axis substantially perpendicular to the axis of the guidemeans.

4. The device of claim 1 in which the guide means has a flared lower endholding the idler means.

5. A method for twisting a yarn comprising: a. removing said yarn from astationary package by passing 'it downwardly through tthe center of thepackage to a twister which swings a free balloon of yarn around saidpackage to induce a twist therein;

b. moving said yarn lengthwise as it is removed from the package andwinding it onto a take-up reel;

c. passing the yarn over an idler means mounted on a rotatable guidemeans positioned between said free balloon and said take-up reel;

d. rotating the guide in the same direction and speed as the twister sothat both ends of the balloon are rotated at the same speed so as todecrease tension in the balloon by eliminating friction opposing saidlengthwise yarn movement.

6. A yarn friction reducing balloon control device for a two for onetwister having a stationary yarn package, a single rotatable twistertube located co-axially within the package, a rotatable disc below thepackage and take-up means above the package forming a free balloon inthe yarn between the disc and the take-up means comprising an elongatedguide tube positioned between the free balloon and the take-up means forthe yarn to pass through, said guide'tube having smoothly curved idlermeans mounted in a plane substantially perpendicular to the longitudinalaxis of the guide means, said plane rotating with the guide means, saidguidetube acting to contact the yarn and guide it without introducingfriction-or interfering with the yarn linear travel therethrough andmeans to-drive said guide tube and twister tube in the same directionand at the same speed.

1. In a two for one strand twisting machine having a stationary yarnpackage, a single rotatable twister tube located co-axially within saidpackage, a rotatable disc below said package and take-up means abovesaid package for drawing yarn therefrom and forming a free balloon inthe yarn between the disc and the takeup means, the improvementcomprising means between the balloon and take-up means to reducefriction on the yarn having: a. a rotatable guide means for the yarn topass through positioned between the free balloon and the take-up means,the guide having smoothly curved idler means to contact and rotate theyarn; b. means to drive the twister tube and the guide means in the samedirection and at the same speed.
 2. The device of claim 1 in which theidler means is a roller mounted for free rotation on an axissubstantially perpendicular to the axis of said guide means.
 3. Thedevice of claim 1 in which the idler means is at least one pin with itsaxis substantially perpendicular to the axis of the guide means.
 4. Thedevice of claim 1 in which the guide means has a flared lower endholding the idler means.
 5. A method for twisting a yarn comprising: a.removing said yarn from a stationary package by passing it downwardlythrough the center of the package to a twister which swings a freeballoon of yarn around said package to induce a twist therein; b. movingsaid yarn lengthwise as it is removed from the paCkage and winding itonto a take-up reel; c. passing the yarn over an idler means mounted ona rotatable guide means positioned between said free balloon and saidtake-up reel; d. rotating the guide in the same direction and speed asthe twister so that both ends of the balloon are rotated at the samespeed so as to decrease tension in the balloon by eliminating frictionopposing said lengthwise yarn movement.
 6. A yarn friction reducingballoon control device for a two for one twister having a stationaryyarn package, a single rotatable twister tube located co-axially withinthe package, a rotatable disc below the package and take-up means abovethe package forming a free balloon in the yarn between the disc and thetake-up means comprising an elongated guide tube positioned between thefree balloon and the take-up means for the yarn to pass through, saidguide tube having smoothly curved idler means mounted in a planesubstantially perpendicular to the longitudinal axis of the guide means,said plane rotating with the guide means, said guide tube acting tocontact the yarn and guide it without introducing friction orinterfering with the yarn linear travel therethrough and means to drivesaid guide tube and twister tube in the same direction and at the samespeed.